Techniques for configuring use of an energy saving mode

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a wireless network device (e.g., a base station or a transmission reception point (TRP) of the base station), a first control message comprising an indication of a set of energy saving modes of the wireless network device. The UE may receive a second control message indicating a first energy saving mode from the set of energy saving modes, where the first energy saving mode may be indicative of a number of channel state information (CSI) reference signal (CSI-RS) resources used by the wireless network device. The UE may monitor one or more of the CSI-RS resources for a CSI-RS in accordance with the first energy saving mode, and transmit, to the wireless network device, CSI feedback determined based on measurements made by the UE of the CSI-RS.

What is claimed is: 
     
         1 . A method for wireless communications at a user equipment (UE), comprising:
 receiving, from a wireless network device, a first control message comprising an indication of a set of configurations of the wireless network device, each configuration indicating a corresponding quantity of channel state information reference signal ports allocated per channel state information reference signal resource;   receiving a second control message indicating a first configuration from the set of configurations, the first configuration indicative of a quantity of channel state information reference signal resources to be used by the wireless network device;   monitoring one or more of the channel state information reference signal resources for a channel state information reference signal in accordance with the first configuration; and   transmitting, to the wireless network device, channel state information feedback determined based at least in part on measurements made by the UE of the channel state information reference signal.   
     
     
         2 . The method of  claim 1 , wherein:
 the set of configurations is associated with a set of energy saving modes; and   the first configuration is associated with a first energy saving mode of the set of energy saving modes.   
     
     
         3 . The method of  claim 1 , further comprising:
 receiving a message identifying a set of channel state information reference signal ports that are activated during the first configuration.   
     
     
         4 . The method of  claim 1 , wherein receiving the set of configurations further comprises:
 receiving an indication of a number of antenna panels of the wireless network device, a number of antenna sub-panels of the wireless network device, or both associated with each configuration of the set of configurations.   
     
     
         5 . The method of  claim 4 , further comprising:
 receiving a message identifying a set of antenna panels, a set of antenna sub-panels, or both that are activated during the first configuration.   
     
     
         6 . The method of  claim 5 , wherein the message comprises an indication of a mapping of a set of channel state information reference signal ports corresponding with each antenna panel of the set of antenna panels, with each antenna sub-panel from the set of antenna sub-panels, or a combination thereof. 
     
     
         7 . The method of  claim 1 , wherein receiving the second control message further comprises:
 receiving a broadcasted message, a UE-specific message, or a group- common message indicating the first configuration from the set of configurations.   
     
     
         8 . The method of  claim 1 , wherein receiving the second control message further comprises:
 receiving a radio resource control reconfiguration message indicating the first configuration based at least in part on a duration between a previous configuration and the first configuration.   
     
     
         9 . The method of  claim 1 , wherein the second control message indicating the first configuration is received based at least in part on a synchronization signal block configuration. 
     
     
         10 . The method of  claim 1 , wherein the wireless network device is a base station, or a transmission reception point of the base station. 
     
     
         11 . A method for wireless communications at a wireless network device, comprising:
 transmitting, to a user equipment (UE), a first control message comprising an indication of a set of configurations of the wireless network device, each configuration indicating a corresponding quantity of channel state information reference signal ports allocated per channel state information reference signal resource;   transmitting a second control message indicating a first configuration from the set of configurations, the first configuration indicative of a quantity of channel state information reference signal resources to be used by the wireless network device;   transmitting one or more channel state information reference signals in accordance with the first configuration; and   receiving, from the UE, channel state information feedback determined based at least in part on measurements made by the UE of the one or more channel state information reference signals.   
     
     
         12 . The method of  claim 11 , wherein:
 the set of configurations is associated with a set of energy saving modes; and   the first configuration is associated with a first energy saving mode of the set of energy saving modes.   
     
     
         13 . The method of  claim 11 , further comprising:
 transmitting a message identifying a set of channel state information reference signal ports that are activated during the first configuration.   
     
     
         14 . The method of  claim 11 , wherein the channel state information reference signal ports are configured into one or more groups. 
     
     
         15 . The method of  claim 11 , wherein transmitting the set of configurations further comprises:
 transmitting an indication of a number of antenna panels, a number of antenna sub-panels, or both associated with each configuration of the set of configurations.   
     
     
         16 . The method of  claim 15 , further comprising:
 transmitting a message identifying a set of antenna panels, a set of antenna sub-panels, or both that are activated during the first configuration.   
     
     
         17 . The method of  claim 16 , wherein the message comprises an indication of a mapping of a set of channel state information reference signal ports corresponding with each antenna panel of the set of antenna panels, with each antenna sub-panel from the set of antenna sub-panels, or a combination thereof. 
     
     
         18 . The method of  claim 11 , further comprising:
 transmitting, one or more channel state information references signals via a set of resources in accordance with a default configuration; and   receiving, from the UE, channel state information feedback determined based at least in part on measurements made by the UE of the one or more channel state information reference signals in accordance with the default configuration.   
     
     
         19 . The method of  claim 18 , further comprising:
 determining to switch to the first configuration from the default configuration, where transmitting the second control message is based at least in part on the determination.   
     
     
         20 . The method of  claim 11 , wherein the first control message indicates that the set of configurations are applicable to uplink communications, downlink communications, or both. 
     
     
         21 . The method of  claim 11 , wherein transmitting the second control message further comprises:
 transmitting a radio resource control reconfiguration message indicating the first configuration based at least in part on a duration between a previous configuration and the first configuration.   
     
     
         22 . The method of  claim 11 , wherein the second control message indicating the first configuration is received based at least in part on a synchronization signal block configuration. 
     
     
         23 . An apparatus for wireless communications, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and executable by the processor to cause the apparatus to:
 receive, from a wireless network device, a first control message comprising an indication of a set of configurations of the wireless network device, each configuration indicating a corresponding quantity of channel state information reference signal ports allocated per channel state information reference signal resource; 
 receive a second control message indicating a first configuration from the set of configurations, the first configuration indicative of a quantity of channel state information reference signal resources to be used by the wireless network device; 
 monitor one or more of the channel state information reference signal resources for a channel state information reference signal in accordance with the first configuration; and 
 transmit, to the wireless network device, channel state information feedback determined based at least in part on measurements made by the apparatus of the channel state information reference signal. 
   
     
     
         24 . The apparatus of  claim 23 , wherein:
 the set of configurations is associated with a set of energy saving modes; and   the first configuration is associated with a first energy saving mode of the set of energy saving modes.   
     
     
         25 . The apparatus of  claim 23 , wherein the instructions are further executable by the processor to cause the apparatus to:
 monitor, prior to receiving the second control message, a set of channel state information reference signal resources for the channel state information reference signal in accordance with a default configuration; and   transmit, to the wireless network device, channel state information feedback determined based at least in part on measurements made by the apparatus of the channel state information reference signal in accordance with the default configuration.   
     
     
         26 . The apparatus of  claim 23 , wherein the instructions to receive the first control message are further executable by the processor to cause the apparatus to:
 receive a radio resource control message comprising the indication of the set of configurations of the wireless network device.   
     
     
         27 . An apparatus for wireless communications, comprising:
 a processor;   memory coupled with the processor; and   instructions stored in the memory and executable by the processor to cause the apparatus to:
 output, to a user equipment (UE), a first control message comprising an indication of a set of configurations of the apparatus, each configuration indicating a corresponding quantity of channel state information reference signal ports allocated per channel state information reference signal resource; 
 output a second control message indicating a first configuration from the set of configurations, the first configuration indicative of a quantity of channel state information reference signal resources to be used by the apparatus; 
 output one or more channel state information reference signals in accordance with the first configuration; and 
 obtain, from the UE, channel state information feedback determined based at least in part on measurements made by the UE of the one or more channel state information reference signals. 
   
     
     
         28 . The apparatus of  claim 27 , wherein:
 the set of configurations is associated with a set of energy saving modes; and   the first configuration is associated with a first energy saving mode of the set of energy saving modes.   
     
     
         29 . The apparatus of  claim 27 , wherein the instructions are further executable by the processor to cause the apparatus to:
 deactivate one or more channel state information reference signals ports, one or more antenna panels, one or more antenna sub-panels, or a combination thereof based at least in part on the first configuration.   
     
     
         30 . The apparatus of  claim 27 , wherein the instructions to transmit the second control message are further executable by the processor to cause the apparatus to:
 transmit a broadcasted message, a UE-specific message, or a group-common message indicating the first configuration from the set of configurations.